public class Posicion {
	private long x, y;

	/* (x-a)^2+(y-b)^2<=R^2 */
	public boolean in(Posicion p, long R){
		boolean b=false;
		if ((Math.pow((p.getX()-x),2) + Math.pow((p.getY()-y),2)) <= Math.pow(R,2)) b = true;
		return b;
	}
}
